1 /* 2 * Copyright (C) 2008 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 #include <stdio.h> 18 #include <fcntl.h> 19 #include <unistd.h> 20 #include <errno.h> 21 #include <string.h> 22 23 #include <sys/types.h> 24 #include <sys/stat.h> 25 26 #define LOG_TAG "Vold" 27 28 #include <cutils/log.h> 29 30 #include "Xwarp.h" 31 const char *Xwarp::XWARP_BACKINGFILE = "/mnt/secure/asec/xwarp.img"; 32 const char *Xwarp::XWARP_CFG = "/sys/fs/yaffs/mtd3/xwarp-backing-store"; 33 const char *Xwarp::XWARP_READY = "/sys/fs/yaffs/mtd3/xwarp-ready"; 34 const char *Xwarp::XWARP_MIRROR_STATUS = "/sys/fs/yaffs/mtd3/xwarp-mirror"; 35 36 int Xwarp::enable() { 37 return doEnableDisable(true); 38 } 39 40 int Xwarp::disable() { 41 return doEnableDisable(false); 42 } 43 44 int Xwarp::status(bool *ready, unsigned *mirrorPos, unsigned *maxSize) { 45 FILE *fp; 46 47 *ready = false; 48 *mirrorPos = 0; 49 *maxSize = 0; 50 if (!(fp = fopen(XWARP_READY, "r"))) { 51 return -1; 52 } 53 54 fscanf(fp, "%d", (int *) ready); 55 fclose(fp); 56 57 if (!(fp = fopen(XWARP_MIRROR_STATUS, "r"))) { 58 return -1; 59 } 60 61 fscanf(fp, "%u %u", mirrorPos, maxSize); 62 fclose(fp); 63 return 0; 64 } 65 66 int Xwarp::doEnableDisable(bool enable) { 67 const char *tmp; 68 int fd = open(XWARP_CFG, O_WRONLY); 69 70 if (fd < 0) 71 return -1; 72 73 tmp = (enable ? XWARP_BACKINGFILE : ""); 74 75 if (write(fd, tmp, strlen(tmp)+1) < 0) { 76 SLOGE("Failed to write xwarp cfg (%s)", strerror(errno)); 77 close(fd); 78 return -1; 79 } 80 81 close(fd); 82 return 0; 83 } 84
